Spartina anglica is a perennial salt marsh grass which has been planted widely to stablize tidal mud flats. Its invasion and spread leads to the exclusion of native plant species and the reduction of ...

Spartina densiflora is an invasive cordgrass that primarily inhabits marsh and wetland environments. It is an extremely aggressive species that is capable of outcompeting native plants in their local ...

The African tulip tree (Spathodea campanulata) is an evergreen tree native to West Africa. It has been introduced throughout the tropics, and, has naturalised in many parts of the Pacific. It favours ...

Although Sphagneticola trilobata is the accepted name for this species, it is widely known as Wedelia trilobata. Sphagneticola trilobata is native to the tropics of Central America and has naturalised ...

Introduced to the Kerguelen Islands, Stellaria alsine is still restricted to a small area on the outskirts of the scientific research base. However, it is the most aggressive introduced plant and it f ...

Stellaria media is an extremely widespread herbaceous annual plant. It is a weed of meadows, gardens and abandoned land. In Europe and North America, it is considered to be an invasive plant. Control ...

Nassella neesiana (Chilean needle grass) threatens the ecological integrity of affected natural ecosystems and also causes significant devastation in agricultural areas due to the reduction in pasture ...

Nassella tenuissima )commonly known as Mexican feather grass) can be a weed in its native range at sites under high disturbance, such as that caused by overgrazing. It forms indigestible balls in the ...

Striga asiatica is an annual parasitic weed of agricultural crops. It has a gigantic impact on human welfare by affecting subsistence farmers and consequently aggravates hunger and poverty. Striga as ...

Native to Europe, Asia and North Africa, Sturnus vulgaris (the European starling) has been introduced globally, save in neotropic regions. The starling prefers lowland habitats and is an aggressive o ...

Styela clava is a fouling organism native to the Pacific Coast of Asia. Because of its hardy nature and ability to withstand salinity and temperature fluctuations, Styela clava easily establishes whe ...

Styela plicata (sea squirt) is a pandemic, temperate to subtropical tunicate. As a pest species, Styela plicata outcompete native encrusters and excludes them from hard substrates. It is a known fou ...

Suncus murinus (the Indian musk shrew) is a commensal and adaptable mammal. It is a rapid coloniser and threatens many plant and animal species through predation and competition. Through human agency ...

Tabebuia heterophylla is a small to medium sized deciduous tree attaining a height of 18m. In its native range it is widespread in abandoned pastures and secondary forests. It has become a problem in ...

Tapinoma melanocephalum is known as a tramp ant as its spread around the globe has been assisted by human activities. It is highly flexible in the habitats it occupies, providing there is some form of ...

Taraxacum officinale is one of the most wide-spread weeds of North America, Asia and Europe. On French sub-Antarctic islands, where Taraxacum officinale has been introduced, the disappearance of nativ ...

Native to the Indo-Pacific area, Technomyrmex albipes, commonly known as the white-footed ant, has spread to Australia, Africa, North America, Caribbean and Asia. Technomyrmex albipes are often found ...

Tecoma stans is a South American tree which has been introduced to other tropical and subtropical regions (Indian Ocean, Pacific, Australia) as an ornamental. Tecoma stans prefers dry and disturbed ar ...

Tetropium fuscum (the brown spruce longhorn beetle) is a high risk invasive species native to Europe and Asia that has been introduced to Nova Scotia, Canada where it has ravaged red spruce (Picea rub ...

Tilapia mariae, or spotted tilapia, is a cichlid native to coastal lagoons in western equatorial Africa that has established populations in Australia and United States. Due to its high fecundity, aggr ...

Yellow oleander, Thevetia peruviana is a bushy shrub native to tropical America. Seedlings can be found on cultivated ground and ex-pasture land. It is cultivated in gardens as an ornamental where it ...

Thunbergia grandiflora is a climbing vine native to Asia which is able to smother native vegetation. Introduced and cultivated in many regions as an ornamental, it has become a widespread invasive pla ...

Tilapia mariae, or spotted tilapia, is a cichlid native to coastal lagoons in western equatorial Africa that has established populations in Australia and United States. Due to its high fecundity, aggr ...

In its native, tropical range, Tilapia zillii is important as a food fish as well as for aquaculture. Tilapia zillii provided 70% of Egypt's fish production, however outside its native range, this fr ...

Tench (Tinca tinca) are a widespread species of freshwater fish native to temperate Europe and Asia. Popular as an angling species, they have been introduced to a number of countries as a sport fish. ...

Tithonia diversifolia is an herbaceous stoloniferous perennial which can reach 2 to 3m high. Originally from Mexico and Central America, it is planted and cultivated in many countries for its beautifu ...

The international movement of non-native forest insects is a threat to forest sustainability worldwide. Tomicus species (Coleoptera, Scolytidae) are important pests of pine forest in Eurasia, Europe a ...

Trachycarpus fortunei, commonly known as the Chinese windmill palm, is an evergreen palm that is primarily cultivated for ornamental purposes. Recognisable by its large, fan-shaped leaves, it can grow ...

Tradescantia fluminensis is endemic to the tropical rainforests of south east Brazil and has naturalised in New Zealand, south-eastern Australia, Portugal, Italy, Russia, Japan and the south-eastern U ...

Tradescantia spathacea is a beautiful succulent that has been introduced to south Asia and many Pacific Islands from its native range in the tropical Americas. Although it has not yet been declared a ...

Trapa natans, commomly known as water chestnut, is an annual plant introduced from Asia and has become abundant in the northeastern United States where it creates a nuisance in lakes, ponds, canals an ...

Triadica sebifera is a tree in the Euphorbiaceae family which typically reaches a maximum height of 15m at maturity. It is adapted to a variety of disturbed sites and a wide range of soil conditions. ...

The brushtail possum (Trichosurus vulpecula) is a solitary, nocturnal, arboreal marsupial introduced from Australia. It damages native forests in New Zealand by selective feeding on foliage and fruits ...

Treidentiger trigonocephalus (the chameleon goby) is a native fish of Asia which is spread through ship ballast water or via eggs laid on hulls. It has established in California and Australia where i ...

The colonial ascidia Trididemnum solidum is present throughout the West Indies to Florida, the Bahamas to Venezuela. T. solidum grow as mat like sheets that can grow over coral, sponges and macroalgae ...

Triphasia trifolia is a shrub that can grow up to 3 metres high. It has been introduced to many tropical and subtropical regions of the world where it is grown for its fruit. It is naturalised in many ...

Trogoderma granarium are considered a pest of considerable impact to stored foodstuffs. It maintains its presence in food storage in very low numbers and is able to survive long periods of time in an ...

Tubastraea coccinea (orange-cup coral) has been introduced to all continents except Antarctica and is thought to compete with native benthic invertebrates for space and to compromise their communities ...

Tussilago farfara is a perennial herb which spreads mainly through underground rhizomes. During the summer, food is stored in the rhizomes for the following year's early spring growth. Tussilago farfa ...

Typha latifolia (cattails) are among the most common of all aquatic plants. They are often a nuisance but also perform an important function in keeping a lake healthy by filtering the runoffs. Typha l ...

Ulex europaeus is a spiny, perennial, evergreen shrub that grows in dense and impenetrable thickets which exclude grazing animals. It is common in disturbed areas, grasslands, shrublands, forest margi ...

Urosalpinx cinerea (the Atlantic oyster drill) is native to the North American Atlantic coast. It has invaded a few bays in the North American Pacific, southern Great Britain and recently the Netherla ...

Low nutrient ecosystems, such as bogs and swamps, often contain unique plant species specially adapted to extreme conditions. While these habitats are more resilient to generalist invasive species the ...

Vallisneria spp. commonly known as eelgrass are popular aquarium plants. They are submerged aquatic plants that can grow up to five metres. They grow in still or flowing water and form a dense monocul ...

Vallisneria spp. commonly known as eelgrass are popular aquarium plants. They are submerged aquatic plants that can grow up to five metres. They grow in still or flowing water and form a dense monocul ...

Varroa destructor is an external parasite found throughout most of the world that attacks all lifecycle stages of a broad range of honeybees. Varroa destructor sucks the blood from both the adults and ...

Verbascum thapsus is an erect herb in the family Scrophulariaceae. It is found in neglected meadows and pasture lands, along fencerows and roadsides. It can produce 100,000-180,000 seeds per individua ...

Verbena brasiliensis is a herb native to South America. It displaces native vegetation through most of its non-native range and is considered invasive. Management for Verbena brasiliensis includes a ...

Vespula vulgaris (the common wasp) nest underground and in the cavities of trees and buildings. In addition to causing painful stings to humans, they compete with other insects and birds for insect p ...

Vitex rotundifolia, also commonly known as beach vitex, is a perennial woody shrub of coastal sand dunes of Asia and the Pacific islands. It has been introduced into the United States where it is an i ...

The European red fox is probably responsible for declines of some small canids and ground-nesting birds in North America, and numerous small- and medium-sized rodents and marsupials in Australia. A pr ...

Vulpia bromoides Is an annual weed of native grasslands and pastures in temperate climates of both the Northern and Southern hemispheres. Weedy annual grasses can reduce biodiversity on native grassla ...

Wasmannia auropunctata (the little fire ant) is blamed for reducing species diversity, reducing overall abundance of flying and tree-dwelling insects, and eliminating arachnid populations. It is also ...

In its alien range, Wisteria floribunda is still used as an ornamental and often escapes from landscapes and becomes invasive in natural ecosystems. Wisteria floribunda infests forest edges and distu ...

Wisteria sinensis invades forest edges and disturbed areas, including riparian zones. It tolerates shade and a variety of soil types. In riparian areas, it spreads downstream as seeds float to new l ...

Xanthium spinosum (Bathurst burr) is classified as a noxious weed in the majority of areas where it has been introduced. It is a prolific seed producer with high germination and survival rates. Xanthi ...

Xenopus laevis (the African clawed frog) is the standard experimental amphibian used in laboratories pan-globally. Escapees have formed viable and invasive populations in many climates, where individ ...

Xiphophorus hellerii is native to Central America. A very popular aquarium fish, it has been introduced to many countries around the world. Although Xiphophorus hellerii is rarely documented, its intr ...

Originally from Asia, Xylosandrus compactus has spread to many coffee growing areas throughout the world where it causes damage not only to agricultural crops, but also to native forest trees. Beetles ...

Xylosandrus mutilatus comes from a family of beetles commonly referred to as bark beetles. Xylosandrus mutilatus construct galleries in the xylem of host trees which can eventually cause mortality in ...

A very popular ornamental species, Zantedeschia aethiopica is cited as invasive in many countries, from hot and moist temperate zones to tropical and subtropical zones. It grows in dense stands preven ...

Zizania latifolia is a perennial aquatic grass. In places where it has been introduced, its dense growth can exclude almost any native species of plant, fish, or animal. It blocks drainage systems and ...

Ziziphus mauritiana is widely cultivated in dry areas throughout the tropics. It tolerates extremely dry habitats and is an extremely valuable tree for people that live in such climates. Ziziphus maur ...

Zoobotryon verticillatum is a stoloniferous fouling organism found in many temperate and warm waters around the world, it is commonly found on boat hulls, which may explain its current worldwide distr ...

Zostera japonica is one of approximately 60 seagrasses, or marine angiosperm species. The only documented invasive seagrass, it has invaded Pacific coast estuaries in Canada and the United States. Zos ...

Zosterops japonicus (Japanese white-eye) is a small songbird that has been introduced to the Pacific region from Asia. It is an arboreal species that can be found in a wide variety of habitats. It is ...